Slenderman Monster

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Nope, you didn't. Well I assume you didn't, I mean, I wasn't exactly looking over your shoulder He was either using an older version of Maya, his display settings were different (you can choose between various "styles" for your joints I think... never used it), or, most likely, he simply had a different display radius set for his joints. Its the value "radius" in the channelbox. Set it to whatever you like, it has no effect other than making joints easier to see and select.